Friction let-off mechanism for looms.



APPLICATION IILED MAR 18, 1908.

Patented Jan. 5, 1909.

5 .N H MM 5 m 5 3 5 z 1 z 0 w \6 W 0 0 W. ,7 1. WW 0 1 rirrun ASHBY, oron'x'r RA; FALLS, RHODE lbLA FRICTION LET-GEE IJKECHANISM FOR LOOMS.

pecilication of Letters Patent.

Patented Jon. 5, 1909.

Application filed March 18, 1933. Serial No. 421.833.

. of Rhode lslund, have invented new and tel weight 'crum stud by asplit pin 13 useful Improvement in Friction Let ll Mechanism for Looms,of which the following is a specification.

This invention has reference to an improvement in looms and moremrticulurly to an improven'icnt in friction lctolf mechanism for looms.

The object. of my the construction of a friction let oll nicchmn ism forlooms whereby the tension meclrzmism and weight are decrmised in sizeand the tension or friction on the warp honm is mlimits. 1

creased or may he varied within wide My invention consists in thepeculiar and n vel construct-ion of a'friction let oll mechanismconsisting principally of a series of A series of live trm'isverse holesl8 l8 invention. is to improve 1 end adopted to extend through the transthe lever is secured to the fulcrum stud 6 by a 13; a. horizontal lever.7 having a through one of which the lever is pivotu-lly secured to thestud I by :1 split pin 13; n horizontal lever ll) having; o verticalhole 2o in its inner end, as shown in broken lines in l ig. 2, and i1.series of transverse holes 2] '31 through one of which the lever ispivotally secured to the stud S by a split pin 13; and a series ofvertical connecting links 22, 23 and 24 each of the connecting linkshaving a pin 25 at each l6 16 through one or much pivotnlly split pinverse holes in the lovers and removubly secured to the lovers by a splitpin 13 through d hole in the end of the pins, as shown in Fig. 3. Thelink 22 connects tlie'outer ends of the levers 9 and i l, the link 23connects the 1 inner ends of the lovers l4 and i7, and the I link 2%connects the outer adjustable compound levers operated liy o.

comparatively light weight and operntively connected with the warp andhaving; details of construction as will he more fully set forthhereinafter and claimed.

Figure i is :1 hack view of u l om provided with my improved frictionlet oll' mechnnism and showing: the some opcrntivcly connected with thewarp beam of the loom. l ig. '2 is an enlarged face view of the tensionmechanism removed from the loom to clearly .show the construction of thesome, and Fig. 3 an enlarged detail sectional view taken on line 3 3 ofFig. 2, sl'iowing the pivot construction of the; levers and connecting:links.

in the drmvings, (1' or ind' frames, 1) the hack cross rail, 0 the warpbeam, 11 the warp, and r the guide roller ol a loom provided with myimproved compound Warp beam tension. mechanism which consists of e plate4 llztVlIlQ a series of four fulcrum studs 5, 6, 7 and h on its face andsecured to the side frame a under the warp beam 0, shown in Fig. l 3 ehorizon lever 9 having the notches ll) 10 for the weight 11 and a seriesof five? transverse holes 112 12 through one of wl'rieli. the weightlever is pivotully secured to the lid 7 through the outer end of thestud; u comparatively short horizontal lever 14- having; a vertical hole15 in its inner end, as shown in. broken lines in Fig. 9 and a series oflive transverse holes ahle hook 26 is held in the heam of u loom.

ends of the lovers 1? and 19, as shown in Fig. An adjusthole in the endof the/ lever 19 by a nut 27. and n cord 28 is secured at one end to thehook 26, carried around the warp l){tl11 0 one or more times,

1 and the other end carried down and secured to the hoclt cross rail1'), as shown in l i l. llic tension or friction of the cord 38 on thewarp ileum c may he vol-led within wide limits by changing the positionof the weight l l on the weight lover S), by changing the posilions ofthe lovers 9, H, l7 and if) on the rule the side i l l studs (j, 7 and8. by changing the position of the comuicting; links 22, 22-; and Z-l onthe lovers, or by removing: the lovers 17 and if) and the links 23 end24: and connecting the hook 26 with the end of the lever i l through thevertical hole l5 in the end of lhe lover.

in. the operation ol my improved wurp beam tension llifl'lizllilsm, thefriction of the cord 28 on the warp hemn c through the i i r a a l lweight ll mid compound lovers .3, 14, 17 and 1!) cites the requiredtension on the warp heum.

hesnn tension mechunism on looms any required tension on the warp beammay be easily and quickly obtained and when required to run the warpthreads heel: the weight lever and compzirntirely light weight- Inoy helifted with sight exertion hy the operator.

it is evident that my improved warp beam tension mechanism may-be usedon either or both sides of a loom and that nnynumhcr of levers andconnecting links may be used without materially affecting the spirit ofmy invention.

Having thus described my invention, I claim as new and desire to secureby Letters Patent 1. In a loom, a warp beam tension mechanism comprisinga plate secured to the loom frame, a system of compound levers pivotallysecured to the plate, an adjustable weight on the lower lever, a cord orits equivalent eratively connecting the upper lever with t e warp beam,and means for adjusting the levers on the plate.

2. In a loom, a warp beam tension mechanism comprising a platesecured tothe loom frame, a system of compound levers pivotally secured to theplate, links pivotally connecting the levers, an adjustable weight onthe lower lever, a cord or its equivalent secured at one end to theupper lever, carried around the warp beam and secured at the other endto the loom frame, means for adjusting the levers on the plate and meansfor adjusting the links 011 the levers.

3. In a loom, a warp beam tension mechanism comprising a plate securedto the loom frame under the warp beam, a system of con pound leversconsisting of a lower weight lever, an upper lever, and one or moreinter-- mediate levers pivotally secured to the plate, links j ustableweight on the lower lever, an adjustable hook in the end of the upperlever, a cord or its equivalent secured at one end. to the adjustablehook, carried around the warp beam; and secured at the other end to theloom frame, means for adjusting the levers on the plate, means foradjusting the pivotally connecting the levers, an adlinks on the levers,and means for adjusting the weight on the lower lever.

4c. In a loom, the combination with the side frames 0, a, the back crossrail 5, and the warp beam 0, of a warp beam tension mechanismf,comprising a plate 4 having the fulcrum studs 5, 6, 7 and 8 and securedto the loom frame nder the warp beam 0, lever 9 having the notches 1010, an adjustable weight 11, and a series of transverse holes 12 12through one of which the lever is pivotally secured to the stud 5 by asplit pin 13 through the end of the stud, a lever 14 having a verticalhole 15 and a series of trans verse holes 16 16 through one of which thelever is pivotally secured to the stud 6 by a split pin 13, a lever 17having a series of transverse holes 18 18 through one of which the leveris pivotally secured to the stud 7 by a split pin 12%, a lever 19 havingthe vertical hole 20 and a series of transverse holes 21 21 pivotallysecured to the stud 8 by a split pin 13, a series of connecting links22, 23 and 24 having a pin 25 at each end adapted to extend through thetransverse holes in the le vers and secured by a split pin 13, anadjustable hook 26 held inthe-end of the lever 19 I by a nut 27, and acord 28 or itsequivalent secured at one end to the hook 26 carried aweight g around the war beam 0 and secured at its other end to the )ackcross rail 1), as described. In testnuony whereof I have signed my nameto this specification 1n the presence of two subscribing witnesses.

PETER ASHBY. Witnesses ADA E. Heenn'ri', J. MILLER.

